exp_calc

README

ExpCalc

表达式计算器

特性

• 参考 xorm、go-playground/validator.v8 等框架，用于实现复杂、灵活的逻辑判断，可用于业务中复杂的条件判断。如广告定向条件、流量分层策略等

安装

go get github.com/ant-libs-go/exp_calc

快速开始

// 注册操作符
Register("in", func(p interface{}, entry *entry) (bool, error) {
	// 解析p中的参数，与entry中的args进行对比判断
	code ...
})

// 创建calc实例
calc := New("appid:in:[1001] & (age:in:{"range": [10,30]} | sex:in:[1,2])")

// 定义参数
p := &struct {
	user int32
	Age  int32
	sex  int32
}{3, 20, 2}

fmt.Println(o.Calculate(p))

Documentation

Index

• func Register(name string, fn func(p interface{}, entry *Entry) (bool, error))
• type Calc
  • func New(exp string) *Calc
  • func (this *Calc) Calculate(p interface{}) (r bool, err error)
• type Entry

Functions

func Register

func Register(name string, fn func(p interface{}, entry *Entry) (bool, error))

Types

type Calc

type Calc struct {
	// contains filtered or unexported fields
}

func New

func New(exp string) *Calc

exp, format see function "exp2Entry":

appid:eq:[]

func (*Calc) Calculate

func (this *Calc) Calculate(p interface{}) (r bool, err error)

type Entry

type Entry struct {
	Name     string
	Args     interface{}
	Operator string
	// contains filtered or unexported fields
}